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Calculate and use Rf values in chromatography

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-PS1-3, NGSS.SEP 5 · England: GCSE Combined Science: Chemical analysis (required practical: chromatography)

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  1. Question 1

    A dye has an Rf value of 0.6 in water. If the solvent front moves 8 cm, how far will the dye move, in cm?

    Answercm

  2. Question 2

    On a chromatogram the solvent front moved 6 cm from the start line and a spot moved 3.5 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  3. Question 3

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 11 cm when the solvent moves 20 cm. Which dye is it?

    • A. dye B
    • B. dye C
    • C. dye D
    • D. dye A

  4. Question 4

    A dye has an Rf value of 0.25 in water. If the solvent front moves 12 cm, how far will the dye move, in cm?

    Answercm

  5. Question 5

    On a chromatogram the solvent front moved 5 cm from the start line and a spot moved 0.4 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  6. Question 6

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 4 cm when the solvent moves 5 cm. Which dye is it?

    • A. dye C
    • B. dye A
    • C. dye B
    • D. dye D

  7. Question 7

    A dye has an Rf value of 0.2 in water. If the solvent front moves 4 cm, how far will the dye move, in cm?

    Answercm

  8. Question 8

    On a chromatogram the solvent front moved 12 cm from the start line and a spot moved 5.9 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  9. Question 9

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 11 cm when the solvent moves 20 cm. Which dye is it?

    • A. dye D
    • B. dye B
    • C. dye A
    • D. dye C

  10. Question 10

    A dye has an Rf value of 0.5 in water. If the solvent front moves 8 cm, how far will the dye move, in cm?

    Answercm

  11. Question 11

    On a chromatogram the solvent front moved 5 cm from the start line and a spot moved 3.5 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  12. Question 12

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 4 cm when the solvent moves 5 cm. Which dye is it?

    • A. dye C
    • B. dye D
    • C. dye B
    • D. dye A

  13. Question 13

    A dye has an Rf value of 0.2 in water. If the solvent front moves 8 cm, how far will the dye move, in cm?

    Answercm

  14. Question 14

    On a chromatogram the solvent front moved 6 cm from the start line and a spot moved 4.9 cm. What is the Rf value of the spot? Give 2 decimal places.

    Answer

  15. Question 15

    Reference Rf values in the same solvent: dye A 0.15, dye B 0.35, dye C 0.55, dye D 0.8. An unknown ink gives one spot that moves 1.75 cm when the solvent moves 5 cm. Which dye is it?

    • A. dye A
    • B. dye B
    • C. dye D
    • D. dye C

  16. Question 16

    A dye has an Rf value of 0.5 in water. If the solvent front moves 6 cm, how far will the dye move, in cm?

    Answercm

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  1. 4.8 cm
  2. 0.58
  3. dye C
  4. 3 cm
  5. 0.08
  6. dye D
  7. 0.8 cm
  8. 0.49
  9. dye C
  10. 4 cm
  11. 0.7
  12. dye D
  13. 1.6 cm
  14. 0.82
  15. dye B
  16. 3 cm